A flexible and highly sensitive nitrite sensor enabled by interconnected 3D porous polyaniline/carbon nanotube conductive hydrogels,Analytical Methods

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A flexible and highly sensitive nitrite sensor enabled by interconnected 3D porous polyaniline/carbon nanotube conductive hydrogels
Analytical Methods ( IF 2.7 ) Pub Date : 2020/01/06 , DOI: 10.1039/c9ay02442e
Fengxian Gao _{1,

2,

3,

4,

5} , He Teng _{1,

2,

3,

4,

5} , Jingyao Song _{1,

2,

3,

4,

5} , Guiyun Xu _{1,

2,

3,

4,

5} , Xiliang Luo _{1,

2,

3,

4,

5}

Affiliation

Conducting polymer hydrogels with superior electrical responsiveness, adjustable chemical properties, and high electrical conductivity are highly desired for electrode materials in assembling flexible and wearable sensors. Herein, we have synthesized PANI–CNT composite hydrogels via a self-assembly strategy for nitrite detection. High-density CNTs are tightly adsorbed onto PANI hydrogels with a 3D porous hierarchical microstructure via π–π interactions to form PANI–CNT hydrogels. The 3D porous network of PANI hydrogels and the high conductivity of CNTs largely benefit electrolyte ion diffusion and transfer. The hydrophilic nature of PANI–CNT hydrogels provides an outstanding interface between electrolytes and electrodes. The PANI–CNT hydrogel-modified electrode shows high sensitivity (271.48 μA mM⁻¹ cm⁻²), with an average response time of 3 s, a linear range from 20 μM to 1.8 mM, and a low detection limit of 7.8 μM. Moreover, a flexible electrochemical sensor for nitrite detection was successfully prepared by coating PANI–CNT hydrogels onto a printed electrode plate, which exhibited good sensitivity (254.54 μA mM⁻¹ cm⁻²). These PANI–CNT hydrogels present giant potential in the designing of flexible and wearable sensors, in which the composite hydrogels can function both as a sensor and an electrolyte storage unit simultaneously.

中文翻译：

通过互连的3D多孔聚苯胺/碳纳米管导电水凝胶实现的灵活而灵敏的亚硝酸盐传感器

具有极佳电响应性，可调节化学性质和高电导率的导电聚合物水凝胶是组装柔性和可穿戴传感器时电极材料的极高需求。在这里，我们通过自组装策略检测亚硝酸盐合成了PANI-CNT复合水凝胶。高密度CNT通过3D多孔分层微结构紧密吸附到PANI水凝胶上π-π相互作用形成PANI-CNT水凝胶。PANI水凝胶的3D多孔网络和CNT的高电导率在很大程度上有利于电解质离子的扩散和转移。PANI-CNT水凝胶的亲水性为电解质和电极之间提供了出色的界面。PANI-CNT水凝胶修饰电极显示出高灵敏度（271.48μAmM ^-1 cm ^-2），平均响应时间为3 s，线性范围为20μM至1.8 mM，检测限低至7.8μM。此外，通过将PANI–CNT水凝胶涂覆到印刷电极板上，成功制备了用于亚硝酸盐检测的柔性电化学传感器，该传感器表现出良好的灵敏度（254.54μAmM ^-1 cm ^-2）。这些PANI–CNT水凝胶在设计柔性和可穿戴传感器方面具有巨大潜力，其中复合水凝胶可以同时充当传感器和电解质存储单元。

更新日期：2020-02-13

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